Speaker
Description
We present a joint strong and weak lensing analysis of Abell 370 using Hubble Space Telescope imaging from the BUFFALO survey and wide-field observations from Subaru/Suprime-Cam. By combining deep, high-resolution data with wide-field coverage, we reconstruct the mass distribution of the cluster from its core to the outskirts.
Using Lenstool, we adopt a hybrid approach that incorporates fixed strong-lensing constraints from gold-class systems and a multi-scale grid for weak lensing in the outer regions. This enables a flexible and accurate mass reconstruction across multiple scales. From the reconstructed mass map, we identify several candidate substructures and compare them with X-ray observations. Among these, one subhalo is confirmed by associated X-ray emission. We further perform a weak-lensing analysis of this subhalo, obtaining M500 ~ (1.07 ±0.79) ×10^14 M☉ and concentration C500 = 4.90 ± 1.44. Our results provide a detailed view of the mass distribution and substructure in Abell 370, demonstrating the power of combined strong and weak lensing analyses.
| Participate the oral/poster presentation award competition | Yes |
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